Artificial tooth



May 8, 1923.

L. M. FARNUM ARTIFICIAL TOOTH Filed Nbv. 22, 1919 51mm 142012 21272 1mm,

Patented May 8, i923.

iris res rarer LEON M. EARNUBI, OF LANSDOVTNE, PENNSYLVANIA, ASSIGNOB TOTHE S. S. WHITE DENTAL MANUFACTURING COMPANY, A OORPQRATIONOFPENNSYLVANIA.

ARTIFICIAL 'lDOTI-I.

Application filed November 22, 1919. Serial No. 339,818. j

1 '0 (ZZZ whom it may concern:

Be it known that I, LEON M. FARNUM, a citizen of the United States, anda resident of Lansdowne, in the county of Delaware, State ofPennsylvania, have invented certain new and useful Improvements inArtificial Teeth, of which the following is a specification, referencebeing had to the accompanying drawings.

My invention relates particularly to artificial teeth that are providedwith means, comprising a metallic anchor, by which they may be attachedto their mounting, and is especially directed to that class ofartificial teeth wherein an anchor of refractory metal is embedded andbaked in the tooth body, and a pin of less refractory metal subsequentlysoldered to said anchor.

The principal objects of my invention are to provide a tooth with ananchor capable of being baked therein, and so formed and constructed asto afford a'highly eiiicient retention for the pin or other securingmember, and having its retaining means so disposed and extended as toavoid visible discoloration of the tooth body.

Other objects of my invention are to provide anartificial tooth with ananchor arranged to afford easyentrance of the pin or other securingmember thereinto, and to produce an undercut cavity surrounding said pinfor the flow of the securing medium, such as solder, which is designedto effect the union of said anchor and pin.

The form of my invention as hereinafter described, comprehends anartificial tooth provided with a pin-receiving cavity and havingembedded therein a cup-shaped anchor comprising a base wall and conicalwalls diverging toward the lingual surface of the tooth body, andterminating in a radially-extending flange, said pin-receiving cavityhaving a transverse dimension less than the transverse dimension of theopen mouth of said cup-shaped anchor, for the reception of a pin to besoldered thereto.

My invention further includes all of the various novel features ofconstruction and arrangement as hereinafter more definitely specified.

In the accompanying drawings, Figure 1 is a longitudinal sectional viewof a tooth in biscuited form, having embedded therein an anchorconstructed in accordance with my invention; Fig. 2 is a longitudinalsectional view of said tooth and anchor after it has been baked or firedand reduced to a porcelain state; Fig. 3 is a longitudinal sectionalview of the porcelain tooth, showing the solderand pin in place to besoldered to the anchor; Fig. l is a longitudinal sectional.

Fig. 9 is an enlarged longitudinal sectional vigw showing the pinsoldered to the anchor. in said fi gures, the tooth body 1 is moldedwith the pin cavity 2, at the'closed end of is a perspective view ofthewhich said tooth body is provided with the v dished anchor plate 3,preferably in the form of an ordinarytin pie-plate, as shown inperspective in Fig. 5, having the base Wall and conical walls 5diverging toward the lingual surface of the tooth body, which terminatein the radial flange 6 extended pe ripherally beyond the cylindricalwalls of the pin cavity 2, as best shown in Fig. 1.

The anchor plate 3 is-formed of a highly refractory metal such asplatinum, that will withstand the high temperature necessary for fusingthe porcelain body 1 of the tooth,

and afiords a metallic attachment to which the pin of a less refractorymetal 7, comprising the shank 8 and head 9, may be secured by solder 10,which may be introduced into the cavity of the anchor plate 3 preferablyin the form of a disk 11, as shownin Figs. 3 and 6, so that when the pinis inserted in the pin cavity 2 and the tooth heated to a temperaturesuthcient to melt the solder 10, said pin may be moved or forced intoengage ment with the base wall i of the anchor plate 3, therebydisplacing the solder and causing it to flow into the annular spaceafforded by the conical walls 5 of the anchor plate 8 to efiect arigidunion between the shank 8 of the pin 7 and said anchor plate It may behere noted that in firing or baking the biscuited tooth body shown inFig. l to form the fused porcelain tooth body shown in Figs. 2, 3 and 4,the shrinkage effected in the fusing operation tends to restrict the pincavity 2, as best shown in Fig.

2, and thereby produce a curved shoulder 13, affording an undercutrecess which is filled by the solder 10, and produces the fillet 15between the flange 6 o1 the anchor plate 3 and the shank 8 or" the pin7, which materially strengthens the union between said anchor plate 3and pin 7, thereby affording a solid head embedded within the tooth bodywhich cannot be withdrawn therefrom.

It will be obvious that the inclined conical walls 5 of the anchor plate3 afford a wide open mouth for the entrance of the shank of the pin 7,so that the end of said shank 8 may not be obstructed, but may be guidedby the inclined walls into a central position to its seat against thebase wall 4 of the anchor plate 3.

Although I have referred to the tooth securing member as a pin, it is tobe understood that it may be of any desired form and, therefore, I donot desire to limit my invention to the precise details of constructionand arrangement as herein set forth, as

it is obvious that various modifications may be made therein wthoutdeparting from the essential features of my invention as defined in theappended claim.

Having thus described my invention, I claim An artificial tooth having apin-receiving cavity, arranged to receive a pin inserted therein, and ananchor baked in the body of aid tooth, and comprising a base wall,forming the buccal wall of said cavity, side walls extended linguallyand arranged to embrace the end portion of said pin in spaced relationtherewith, and terminating lingually in a flange extended laterallytherefrom, and embedded in the body of said tooth.

In witness whereof, I have hereunto set my hand this 21st day ofNovember, A. 1).,

LEON M. FARNUM. Witnesses:

lViLLIAM J. RUSSELL, CLIFTON C. HALLOWELL.

